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Learn Data Structures and Algorithms in C++

Problem: Merge Two Sorted Lists

Explore how to merge two sorted linked lists in C++ by using a dummy node and two-pointer method. This lesson guides you through step-by-step logic to iterate through both lists, attach the smaller nodes, and handle remaining nodes efficiently, helping you implement a clean and linear-time merge function.

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Statement

Given the heads of two sorted linked lists, list1 and list2, merge them into a single sorted linked list by splicing together the nodes from both input lists.

Return the head of the resulting merged linked list.

Note: Both list1 and list2 are sorted in non-decreasing order.

Constraints:

  • The number of nodes in each list is in the range [0,50][0, 50].

  • −100≤-100 \leq Node.val ...